* AVX512 and later are/will only supported by Windows 10.x / Server 2016.

Older operating systems like Windows XP, Windows Vista and earlier have not been updated and are not likely to be.

If you are running under a VM / Hypervisor (e.g. Hyper-V), it may disable support for various instruction sets (including OS-XSAVE) in order to facilitate migration across hardware (as migrating to a system that supports less features might cause software to crash).